import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * Description:
 */
public class TestDemo {
    public static void main(String[] args) {
        List<Integer> data = new ArrayList<>();
        data.add(51);
        data.add(33);
        data.add(91);
        data.add(83);
        System.out.println("========");
        Collections.sort(data);
        System.out.println(data);
    }
}
